Process of making boric acid and sodium borate.



HQBLUMENBERG, JR. PROCESS OF MAKING BORIC ACID AND SODIUM BORATE.

APPLICATION FILED DECAL 19H- Patented Mar. 4, 1919.

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form a illustrated,

HENRY BLUMENBERG, JR., OF LOS ANGELES,

CALIFORNIA ra ion CALIFORNIA,.ASSIGNOR T0 CHEMICAL PROGE$S OF MAKING- ."BORIC ACID AND SODIUM BORATE.

Specification of Letters Patent.

Patented Mar. 4, 1919..

Application filed December 4, 1917. Serial No. 205450.

To all whom it may concern:

Be it known that I, HENRY BLUMENBERG, J12, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Processes of aking Boric Acid and Sodium Borate, of which the following is a specification.

My invention relates to a process of recovering borax from waste gases of borax' ore calcining apparatus to In ke boric acid and large quantity of borax is obtained.

. from the treatment of calcium borate ores,

such as colemanlte, pandermite, and prlceite, Some contain as much as ater of crystallization twenty molecules of w preliminary treatand it is necessar as a ment of i e borax ores, to calcination to expel the Water of crystallization. he ore is calcined it becomes extremely friable and fluffy and large quantities are lost, being carried along in the Waste gases passing through the chimney and into the atmosphere. sidera'ble, the solid matter of the waste gases contalnln as much as forty to fifty per cent. ut-the dust that settles upon the surrounding land is a nuisance as it injures the Vegetation.

arious methods, such as precipitating the rax ore dust by means of electricity, have lation and uncertain in operation.

have invented a simple and inexpensive process of recovering the borax ore dust carried in the waste gases. 7

y invention consists in the steps of the process hereinafter described and claimed.

In the accompanying drawings which part of this specification, I have by Way of example, an apparatus suitable for carrying out my process.

In thedrawings, l0 designates the stack end of a calcining apparatus which is here shown to. be of the rotary cylindrical type The waste gases enter the lower end of the stack or chimney 12 which,

- may be closed. at the top.

subject themto Not only is this loss containing borates in acid from the however, is only used when for any reason the precipitating apparatus hereinafter described is not in operation. 13 is a lid or damper normally closing the stack 12. is a conduit for conveying the waste gases into a precipitating chamber or tower 15. 16 is a slide-valve whereby the conduit 14 he tower 15 has an exit 17 A series of bafiie plates 18, which are here shown arranged in staggered relation but which may be of any preferred construction, are provided in the interior of the'tower 15. 19 is a tank from which, by means of a pump 20, a liquid may pumped through pipe :21 to the top of the tower 1 5 and there sprayed by means of a nozzle 22, the liquid'being retarded in its downward passage by the baffle plates 18 in the well-known manner, thereby allowing the same to become returned, by means of pipe 23, to the tank 19 which latter is provided with a valved outlet 2st whencethe liquor may be conveyed to filter presses 25 for separating the liquid from stituents.

nitric acid may be used, forming calcium By the use of the acids and the'sodium carbonate, I precipitate the greater portion of the solid constituents of the waste gases, thereby not only eliminating a nuisance but effecting a saving of the borax ore hitherto gone to waste.

I claim:

1. A process of treating waste gases consuspension, comprising with an acid, thereby acid, and separating the boric mass.

treating said gases forming 'boric the solid con- 2. A process of treating Waste gases conprising treating said gases with sulfuric i taining calcium borates in suspension, comacid, thereby forming boric acid and calcium prising treating said gases with an acid, sulfate, and separating the boric acid from 10 thereby forming boric acid, and separating the mass.

5 the boric acid from the mass. In testimony whereof I have signed my I,

3. A process of treating Waste gases eonname to this specification. raining caleium borates in suspension, com- HENRY BLUMENBERG, JR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,

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